September weather forecast
Baucau, East Timor

September

Weather in September

As September sets in, the prolonged dry period gradually starts transitioning to the wet season once again. Baucau's weather in September, however, is typified by sun-drenched days marked by increased sunshine hours. The UV index is consistently high and requires careful safeguarding against excessive sun exposure. Sea temperatures return to their annual high, providing excellent conditions for water-based activities. Despite this returning trend towards the tropical monsoon climate, September remains essentially dry.

Temperature

Baucau's shift into September sets the average high-temperature at a still warm 29.4°C (84.9°F), a figure that deviates only slightly from August's 28.2°C (82.8°F). The nighttime temperature, during September, averages of 18.5°C (65.3°F).

Heat index

In September, the average heat index is evaluated at a hot 31°C (87.8°F). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.

Humidity

The least humid month is September, with an average relative humidity of 55%.

Rainfall

September is the month with the least rainfall, with 5mm (0.2") of accumulated precipitation.

Sea temperature

July through September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater.
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of September, sunrise is at 06:35 and sunset at 18:32. On the last day of the month, sunrise is at 06:18 and sunset at 18:29 +09.

Sunshine

The average sunshine in September is 10h.

UV index

The months with the highest UV index are January through April, August through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 12 suggests this advice:
Put into action all important safeguards, unprotected skin may burn swiftly. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Even on overcast days, apply and frequently reapply a sunscreen with SPF 30 or more, specifically after a swim or outdoor workout. Alert! The Sun's UV rays are heightened by the reflection of sand and water.

Frequently asked questions

How hot is September?
In September, in Baucau, the average high-temperature is 29.4°C (84.9°F), and the average low-temperature is 18.5°C (65.3°F). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 31°C (87.8°F).
What is the least humid month?
September is the least humid month, with an average relative humidity of 55%.
What is the average humidity in September?
In Baucau, the average relative humidity in September is 55%.
What is the driest month?
September is the month with the least rainfall in Baucau, with 5mm (0.2") of accumulated precipitation.
How much does it rain in September?
Throughout September, 5mm (0.2") of precipitation is accumulated.
When is the sea coldest?
July through September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater.
How warm is the water in September?
In Baucau, in September, the average water temperature is 27°C (80.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.
How many hours of daylight does Baucau have in September?
The average day length in September is 12h and 4min.
What time are sunrise and sunset in September in Baucau?
In September, on the first day of the month, sunrise is at 06:35 and sunset at 18:32. On the last day of the month, sunrise is at 06:18 and sunset at 18:29 +09.
How long on average sun shines in September?
The average sunshine duration in September is 10h.
What is the month with the highest UV index?
January through April, August through December, with an average maximum UV index of 12, are months with the highest UV index.
What is the UV index intensity in September?
In September, the average daily maximum UV index in Baucau is 12. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average UV index
Average temperature in September
Baucau, East Timor
  • Average high temperature in September: 29.4°C

The warmest month (with the highest average high temperature) is November (30.2°C).
The month with the lowest average high temperature is February (27.3°C).

  • Average low temperature in September: 18.5°C

The month with the highest average low temperature is January (22°C).
The coldest month (with the lowest average low temperature) is October (17.8°C).

Average humidity in September
Baucau, East Timor
  • Average humidity in September: 55%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is September (55%).

Average rainfall in September
Baucau, East Timor
  • Average rainfall in September: 4.8mm

The wettest month (with the highest rainfall) is February (220.7mm).
The driest month (with the least rainfall) is September (4.8mm).

Average rainfall days in September
Baucau, East Timor
  • Average rainfall days in September: 0 days

The month with the highest number of rainy days is January (20 days).
The month with the least rainy days is September (0 days).

Average sea temperature in September
Baucau, East Timor
  • Average sea temperature in September: 27°C

The best months for swimming (with the highest average sea temperature) are November and December (30°C).
The coldest months (with the lowest average sea temperature) are July, August and September (27°C).

Average daylight in September /
Average sunshine in September
Baucau, East Timor
  • Average daylight in September: 12h and 1min

The month with the longest days is December (Average daylight: 12h and 36min).
The month with the shortest days is June (Average daylight: 11h and 36min).

  • Average sunshine in September: 10h and 0min

The months with the most sunshine are October and November (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

Average UV index in September
Baucau, East Timor
  • Average UV index in September: 12

The months with the highest UV index are January, February, March, April, August, September, October, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 10).

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